FUNCTION
CONTROL VALVE
5
3
CONTROL VALVE 3J0AX00
Anti-cavitation valve
This valve is inserted between the cylinder port and the
tank passage. It works to supply oil from the tank to pre-
vent cavitation when the cylinder is operated at a speed
that is too fast for the oil supply to keep up, which would
cause the pressure of the cylinder port to become almost
negative.
Under normal conditions, a pressure is applied to the cyl-
inder port (P), which causes the poppet (1) to remain
closed. A negative pressure arises in the cylinder port
(P). When the pressure drops below that in the tank pas-
sage (T), the poppet (1) is pushed open, allowing oil to
flow from the tank passage (T) and into the cylinder port
(P).
Anti-drift valve
This valve is installed in the head side of the cylinder cir-
cuit of the boom section. It is designed to prevent oil from
leaking into the cylinder head circuit when the spools are
in the neutral position and to decrease the natural drop
of the boom.
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